<template>
  <div id="tags-view-container" class="tags-view-container">
    <scroll-pane
      ref="scrollPane"
      class="tags-view-wrapper"
      @scroll="handleScroll"
    >
      <!-- 补充 -->
      <!-- 左边按钮 -->
      <el-link
        icon="el-icon-d-arrow-left"
        class="el-tabs__nav-prev el-tabs__btn"
        :underline="false"
        style="font-size: 19px"
        @click="prevBtn"
      />

      <!-- 首页 -->
      <router-link
        :class="this.$route.path == '/dashboard' ? 'active' : ''"
        to="/dashboard"
        class="el-tabs__btn user-home"
      >
        <template> <i class="el-icon-s-home"></i><span>工作台</span> </template>
      </router-link>

      <!-- 右边按钮 -->
      <el-link
        icon="el-icon-d-arrow-right"
        class="el-tabs__nav-next el-tabs__btn"
        :underline="false"
        style="font-size: 19px"
        @click="nextBtn"
      />

      <router-link
        v-for="tag in visitedViews"
        ref="tag"
        :key="tag.path"
        :class="isActive(tag) ? 'active' : ''"
        :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
        tag="span"
        class="tags-view-item"
        @click.middle.native="!isAffix(tag) ? closeSelectedTag(tag) : ''"
        @contextmenu.prevent.native="openMenu(tag, $event)"
      >
        {{ tag.title }}
        <span
          v-if="!isAffix(tag)"
          class="el-icon-close"
          @click.prevent.stop="closeSelectedTag(tag)"
        />
      </router-link>
    </scroll-pane>
    <ul
      v-show="visible"
      :style="{ left: left + 'px', top: top + 'px' }"
      class="contextmenu"
    >
      <li @click="refreshSelectedTag(selectedTag)">Refresh</li>
      <li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)">
        Close
      </li>
      <li @click="closeOthersTags">Close Others</li>
      <li @click="closeAllTags(selectedTag)">Close All</li>
    </ul>
  </div>
</template>

<script>
import ScrollPane from './ScrollPane'
import path from 'path'

export default {
  components: { ScrollPane },
  data () {
    return {
      visible: false,
      top: 0,
      left: 0,
      selectedTag: {},
      affixTags: []
    }
  },
  computed: {
    visitedViews () {
      return this.$store.state.tagsView.visitedViews
    },
    routes () {
      // return this.$store.state.permission.routes
      // return this.$router.options.routes.concat(global.antRouter);
    }
  },
  watch: {
    $route () {
      this.addTags()
      this.moveToCurrentTag()
    },
    visible (value) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu)
      } else {
        document.body.removeEventListener('click', this.closeMenu)
      }
    }
  },
  mounted () {
    this.initTags()
    this.addTags()
  },
  methods: {
    // Tab左边点击事件
    prevBtn () {
      const tags = this.$refs.tag
      this.$refs.scrollPane.moveToTarget(tags[0])
    },
    // Tab右边点击事件
    nextBtn () {
      const tags = this.$refs.tag
      const lenght = tags.length
      this.$refs.scrollPane.moveToTarget(tags[lenght - 1])
    },
    isActive (route) {
      return route.path === this.$route.path
    },
    isAffix (tag) {
      return tag.meta && tag.meta.affix
    },
    filterAffixTags (routes, basePath = '/') {
      let tags = []
      // routes.forEach((route) => {
      //   if (route.meta && route.meta.affix) {
      //     const tagPath = path.resolve(basePath, route.path);
      //     tags.push({
      //       fullPath: tagPath,
      //       path: tagPath,
      //       name: route.name,
      //       meta: { ...route.meta },
      //     });
      //   }
      //   if (route.children) {
      //     const tempTags = this.filterAffixTags(route.children, route.path);
      //     if (tempTags.length >= 1) {
      //       tags = [...tags, ...tempTags];
      //     }
      //   }
      // });
      return tags
    },
    initTags () {
      const affixTags = (this.affixTags = this.filterAffixTags(this.routes))
      for (const tag of affixTags) {
        // Must have tag name
        console.log('执行l')
        if (tag.name) {
          // this.$store.dispatch("tagsView/addVisitedView", tag);
        }
      }
    },
    addTags () {
      const { name } = this.$route
      if (name) {
        this.$store.dispatch('tagsView/addView', this.$route)
      }
      return false
    },
    moveToCurrentTag () {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag)
            // when query is different then update
            if (tag.to.fullPath !== this.$route.fullPath) {
              this.$store.dispatch('tagsView/updateVisitedView', this.$route)
            }
            break
          }
        }
      })
    },
    refreshSelectedTag (view) {
      this.$store.dispatch('tagsView/delCachedView', view).then(() => {
        const { fullPath } = view
        this.$nextTick(() => {
          this.$router.replace({
            path: '/redirect' + fullPath
          })
        })
      })
    },
    closeSelectedTag (view) {
      this.$store
        .dispatch('tagsView/delView', view)
        .then(({ visitedViews }) => {
          if (this.isActive(view)) {
            this.toLastView(visitedViews, view)
          }
        })
    },
    closeOthersTags () {
      this.$router.push(this.selectedTag)
      this.$store
        .dispatch('tagsView/delOthersViews', this.selectedTag)
        .then(() => {
          this.moveToCurrentTag()
        })
    },
    closeAllTags (view) {
      this.$store.dispatch('tagsView/delAllViews').then(({ visitedViews }) => {
        if (this.affixTags.some(tag => tag.path === view.path)) {
          return
        }
        this.toLastView(visitedViews, view)
      })
    },
    toLastView (visitedViews, view) {
      const latestView = visitedViews.slice(-1)[0]
      if (latestView) {
        this.$router.push(latestView.fullPath)
      } else {
        // now the default is to redirect to the home page if there is no tags-view,
        // you can adjust it according to your needs.
        if (view.name === 'Dashboard') {
          // to reload home page
          this.$router.replace({ path: '/redirect' + view.fullPath })
        } else {
          this.$router.push('/')
        }
      }
    },
    openMenu (tag, e) {
      const menuMinWidth = 105
      const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
      const offsetWidth = this.$el.offsetWidth // container width
      const maxLeft = offsetWidth - menuMinWidth // left boundary
      const left = e.clientX - offsetLeft + 15 // 15: margin right

      if (left > maxLeft) {
        this.left = maxLeft
      } else {
        this.left = left
      }

      this.top = e.clientY
      this.visible = true
      this.selectedTag = tag
    },
    closeMenu () {
      this.visible = false
    },
    handleScroll () {
      this.closeMenu()
    }
  }
}
</script>

<style lang="scss" scoped>
.tags-view-container {
  height: 40px;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #e8eaec;
  // border-bottom: 1px solid #d8dce5;
  // box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

  .tags-view-wrapper {
    height: 40px !important;
    padding: 0 0 0 40px;
    // background: yellow;

    .tags-view-item {
      display: inline-block;
      position: relative;
      cursor: pointer;
      height: 40px;
      line-height: 40px;
      border-right: 1px solid #e8eaec;
      color: #606266;
      background: #fff;
      padding: 0 6px;
      font-size: 12px;
      padding: 0 18px;
      font-size: 14px;
      // margin-left: 4px;
      // margin-top: 4px;
      border-radius: 3px 3px 3px 3px;
      &:first-of-type {
        // margin-left: 15px;
      }
      &:last-of-type {
        margin-right: 40px;
      }
      &.active {
        background-color: #ebeef5 !important;
        color: #1890ff !important;
        border-right: 1px solid #e8eaec !important;
        // &::before {
        //   content: '';
        //   background: #fff;
        //   display: inline-block;
        //   width: 8px;
        //   height: 8px;
        //   border-radius: 50%;
        //   position: relative;
        //   margin-right: 2px;
        // }
      }
    }
  }
  .el-tabs__btn {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    cursor: pointer;
    background-color: #fff;
    border-bottom: 1px solid #e8eaec;
    // background-color: skyblue;
    z-index: 10;
    position: absolute;
    font-size: 13px;
    &:first-of-type {
      border-right: 1px solid #e8eaec;
    }
    &:last-of-type {
      border-left: 1px solid #e8eaec;
    }
  }
  // 补充
  .user-home {
    width: 70px !important;
    left: 40px;
    border-right: 1px solid #e8eaec;
    color: #ff9800;
    &.active {
      background-color: #ebeef5;
      color: #409efe !important;
    }
  }
  // 补充
  .contextmenu {
    margin: 0;
    background: #fff;
    z-index: 3000;
    position: absolute;
    list-style-type: none;
    padding: 5px 0;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 400;
    color: #333;
    box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
    li {
      margin: 0;
      padding: 7px 16px;
      cursor: pointer;
      &:hover {
        background: #eee;
      }
    }
  }
}
</style>

<style lang="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
  .tags-view-item {
    display: flex;
    align-items: center;
    .el-icon-close {
      width: 16px;
      height: 16px;
      font-size: 12px;
      // vertical-align: 2px;
      border-radius: 50%;
      text-align: center;
      transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
      transform-origin: 100% 50%;
      // &:before {
      //   transform: scale(0.6);
      //   display: inline-block;
      //   vertical-align: -3px;
      // }
      // &:hover {
      //   background-color: #b4bccc;
      //   color: #fff;
      // }
    }
  }
}
</style>
